socket.io how to install?

Question

Node.js

npm install socket.io
var io = require('socket.io');
Error: Cannot find module 'socket.io'
Why? I did everything as in the dock?

Answer 1

For those who are looking for a solution.
In package.json

"dependencies": {
........
"socket.io-client": "file:socket.io",
"socket.io": "latest"
}

then
npm install

Answer 2

Socket.io is not needed for anything. Check out this websocket example: https://github.com/HowProgrammingWorks/WebsocketChat